ExtJs Direct. Exception handling.

ExtJs Direct. Exception handling.

How can I detect exception message that is raised in "DirectMethod"? Instead of real message I have hardcoded message: "Unable to connect to the server." appended somewhere in extjs sources. Sound like I need to parse xhr.responseText, which is really unusable. Probably, I miss something. I hope there are other way elicit exception message.
Any hints?
thanks in advance.